mailplus_move_messages

THE RISK

Medium Risk

Why mailplus_move_messages needs a policy

Moving messages modifies their folder location reversibly—messages are not deleted, just relocated. This is not Read (it mutates state), not Destructive (it's reversible; messages can be moved back), not Execute/Financial/Other. Write is appropriate.

From the tool's definition Tool description states it 'Move[s] MailPlus messages to another folder', which is a reversible modification of message state. The tool requires confirm=true, indicating operational safeguards.

Documented attack patterns abuse exactly the kind of access mailplus_move_messages gives an agent:

POLICY

How to control mailplus_move_messages

PolicyLayer is an MCP gateway — it sits between your AI agents and Synology Office, and nothing reaches the server without passing your rules. This is the rule we recommend for mailplus_move_messages:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "mailplus_move_messages": {
      "limits": [
        {
          "counter": "mailplus_move_messages_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

mailplus_move_messages stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register Synology Office — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Synology Office tools

Destructive calendar_delete_event Delete a Synology Calendar event permanently. Requires confirm=true. Destructive drive_delete_file Delete a file or folder in Synology Drive (moves to trash by default). Set confirm=true to Destructive spreadsheet_delete_file WARNING: Permanently delete an ENTIRE spreadsheet file (.osheet). Destructive spreadsheet_delete_sheet Delete a sheet tab from a Synology Spreadsheet. This action cannot be undone. Provide eith Write spreadsheet_append_rows Append rows to the end of existing data in a Synology Spreadsheet sheet. Provide either fi Write drive_get_sharing_link Generate or retrieve a sharing link for a Synology Drive file with configurable permission Write calendar_create_calendar Create a new Synology Calendar. Write calendar_create_event Create a new Synology Calendar event. Requires confirm=true.

All 39 Synology Office tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about mailplus_move_messages

What does the mailplus_move_messages tool do? +

Move MailPlus messages to another folder. Requires confirm=true to execute. It is categorised as a Write tool in the Synology Office MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on mailplus_move_messages? +

Register the Synology Office MCP server in PolicyLayer and add a rule for mailplus_move_messages: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Synology Office. Nothing to install.

What risk level is mailplus_move_messages? +

mailplus_move_messages is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit mailplus_move_messages? +

Yes. Add a rate_limit block to the mailplus_move_messages rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block mailplus_move_messages completely? +

Set action: deny in the PolicyLayer policy for mailplus_move_messages. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides mailplus_move_messages? +

mailplus_move_messages is provided by the Synology Office MCP server (vocweb/synology-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Synology Office tool call.

Start from Synology Office, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →